Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8441161 | Electric motor drive device | Tomoaki Makino, Ken Yamamoto | 2013-05-14 |
| 7232372 | Tripod constant velocity universal joint | Haruo Nagatani, Tatsuro Sugiyama | 2007-06-19 |
| 6736730 | Tripod type constant-velocity joint | Tatsuro Sugiyama, Haruo Nagatani, Masashi Hashiya | 2004-05-18 |